The Effects of Plants on River Conditions: III. Crop Studies and Estimates of Net Productivity of Macrophytes in Four Streams in Southern England

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Abstract
In the 4 rivers tudied (Chess, Ivel, Test and Yare), maximum crops of 99-142. g organic carbon/m2 and net productivities of 1.5-2.3 g organic carbon/m2 day were recorded.